APM 550

The APM 550 system is a manual method for sampling fine particles (PM2.5 fraction) and is based on impactor designs standardized by USEPA for ambient air quality monitoring. Ambient air enters the APM 550 series samplers system through an omnidirectional inlet designed to provide a clean aerodynamic cut-point for particles greater than 10 microns. Particles in the air stream finer than 10 microns proceed to a second impactor that has an aerodynamic cut-point of 2.5 microns. The air sample and fine particulates exiting from the PM 2.5 impactor are passed through a 47 mm diameter Teflon filter membrane that retains the fine particulate matter. The sampling rate of the system is held constant at 1 cubic meter per hour by a suitable critical orifice. The standard system is supplied with a Dry Gas Meter to provide a direct measure of the total air volume sampled.

Special features:

• PM10 and PM2.5 Impactors of sampler based on designs standardized by US EPA
• Two part cabinet ensures that the temperature of the PM 2.5 filter remains close to ambient temperature
• Imported brush-less pump with a low noise
• The lower sampling rate of 1m3/hr reduces filter choking even in areas having high FPM levels
• Critical Orifice maintains constant a sampling rate of 1 m3/hour
• Compact and portable

Owing to its modular design, APM 550 can be easily paired with a gaseous sampling attachment (for monitoring SO2, NOx, NH3, Ozone, etc) as gaseous sampling requires only a few LPMs of airflow. This is possible through an attachable subsidiary unit APM 411 or the more modern APM 411TE. Kindly refer to the respective brochures of APM 411 and APM 411TE for details